Water is now in Yunnan of China. A．on ne_爱下问搜题

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问题选择题

Water is now in Yunnan of China.

A．on need

B．in demand

C．by request

D．for requirement

答案

答案：B

选择题

In some cities the traffic police use computers to keep the traffic________smoothly.

A．being run

B．run

C．to run

D．running

单项选择题

在纯电感交流电路中电压超前（）90°。

A.电阻

B.电感

C.电压

D.电流